What to study in gap days ???

So just done with my 10th boards and wanted to start studying for 11th (jee) . I am enrolled in arjuna jee which starts from 7th april untill then i have around 25 days . I am confused what to do in these gap days . I am chilling but want to study atleast 5hr a day as i am not excellent in academics (maths -95 and science-96 expected marks) can't understand what to do . Should start learning some basic concepts (if yes then what ??) Or start with last years arjuna lectures ? as i have khazana . Help me out seniors.